1620s, "action of driving out with violence and noise," from French explosion, from Latin explosionem (nominative explosio) "a driving off by clapping," noun of action from past participle stem of explodere "drive out by clapping" (see explode for origin and sense evolution). Meaning "a going off with violence and noise" is from 1660s. Sense of "a rapid increase or development" is first attested 1953.
